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Acquisitions, Dispositions and Other Significant Transactions - Welltower Lease and RIDEA Venture Restructuring (Details)
$ in Thousands
3 Months Ended 12 Months Ended 36 Months Ended
Jun. 30, 2018
USD ($)
lease_portfolio
community
Dec. 31, 2019
USD ($)
lease
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
lease
community
Jun. 30, 2018
USD ($)
community
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
lease
community
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
lease
community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of communities leased | lease   242               242     242
Payments for lease termination                   $ 0 $ 12,548 $ 552  
Loss on facility lease termination and modification, net   $ (1,382) $ 0 $ (1,797) $ (209) $ (13,197) $ (2,337) $ (146,467) $ 0 $ 3,388 162,001 14,276  
Base rent                     303,294 $ 339,721  
Ownership Percentage   50.00%               50.00%     50.00%
Master leases not renewed, number of communities | community             11            
37 Communities Disposed Of Through Lease Terminations                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of communities disposed of | community                         243
Welltower Lease Transactions                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of leases not renewed | lease             2            
Number of communities managed | community                   74      
Welltower Lease Transactions | 37 Communities Disposed Of Through Lease Terminations                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of communities disposed of | community 37                        
Welltower Inc. | Welltower Lease Transactions                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of lease portfolios | lease_portfolio 2                        
Payments for lease termination               58,000          
Loss on facility lease termination and modification, net                     $ (22,600)    
Rent credit, potential future lease terminations 6.25%                        
Proceeds from sale of equity method investment               33,500          
Gain on sale of equity method investment               $ 14,700          
Welltower Inc. | Welltower Lease Transactions, Lease Portfolio Maturing In 2028                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of communities leased | community 27             27          
Welltower Inc. | Welltower Lease Transactions, Lease Portfolio Maturing In 2020                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of communities leased | community 10             10          
Maximum | Welltower Inc. | Welltower Lease Transactions                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Base rent $ 5,000                        
Welltower RIDEA                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Ownership Percentage 20.00%             20.00%